Very strange I don't have it in sage-on-gentoo.
objdump -T --demangle  /usr/lib64/libcsage.so |grep ZZ_p_to_int
0000000000009320 g    DF .text  000000000000000e  Base        ZZ_p_to_int

sage -v
Sage Version 6.5.beta1, Release Date: 2014-11-23 

We had a few issue with C++ ompiling during the upgrade and more have
surfaced on my side with people trying out -flto but not that particular 
symbol. flto seems to mess up inline templates the same way that we found
not all versions of were producing symbol for them in 
http://trac.sagemath.org/ticket/16882
as pointed out by Volker.

Since gcc 4.9.2 is shipped in sage and a number of people are using it
I would be looking at any flags you are using. I may have a shot at 
gcc 4.9.2 here.

Francois

On Sun, 30 Nov 2014 11:44:09 Paulo César Pereira de Andrade wrote:
>   I think this may have been working somewhat of by accident
> before, because it says 'extern "C"' in one place and in another
> say '// sorry, if you want a C version, feel free to add it'
> 
>   I delayed a bit sagemath 6.4 update due to some dependencies
> needing to be updated in Fedora, in the meantime 6.4.1 was
> released.
> 
>   Trying to update to Fedora sagemath rpm to 6.4.1 I am being
> hit by this:
> 
> ---%<---
>   File
> "/home/pcpa/rpmbuild/BUILDROOT/sagemath-6.4.1-1.fc22.x86_64/usr/lib64/pytho
> n2.7/site-packages/sage/libs/ntl/__init__.py", line 1, in <module>
>     import all
>   File
> "/home/pcpa/rpmbuild/BUILDROOT/sagemath-6.4.1-1.fc22.x86_64/usr/lib64/pytho
> n2.7/site-packages/sage/libs/ntl/all.py", line 34, in <module>
>     from sage.libs.ntl.ntl_ZZ_p import (
> ImportError:
> /home/pcpa/rpmbuild/BUILDROOT/sagemath-6.4.1-1.fc22.x86_64/usr/lib64/python
> 2.7/site-packages/sage/libs/ntl/ntl_ZZ_p.so: undefined symbol: ZZ_p_to_int
> error: Bad exit status from /var/tmp/rpm-tmp.moMkJq (%install)
> ---%<---
> 
>   Previously it was exported as a "C" symbol:
> 
> $ rpm -q sagemath
> sagemath-6.3-3.fc22.x86_64
> $ objdump -T --demangle /usr/lib64/libcsage.so | grep ZZ_p_to_int
> 0000000000008760 g    DF .text  0000000000000005  Base        ZZ_p_to_int
> 
>   But the newly generated libcsage.so does only show a C++ symbol:
> $ objdump -T --demangle BUILD/sage-6.4.1/src/c_lib/libcsage.so | grep
> ZZ_p_to_int
> 00000000000087d0 g    DF .text  0000000000000005  Base
> ZZ_p_to_int(NTL::ZZ_p const&)
> 
>   So, it may be required some extra wrapping, but more likely,
> patch the cython code to only use ZZ_to_int(ZZ*).
> 
>   This may also be useful...
> $ rpm -q gcc binutils
> gcc-4.9.2-1.fc22.x86_64
> binutils-2.24-29.fc22.x86_64
> 
> Thanks,
> Paulo

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